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Groovy: whats the purpose of def in def x = 0? It's somewhat acceptable in scripts (Groovy scripts and groovysh allow you to do so), but in production code it's one of the biggest evils you can come across which is why you must define a variable with def in all actual groovy code (anything inside a class) Here's an example of why it's bad
What is the ?: operator used for in Groovy? - Stack Overflow x || y; Logical OR automatically returns y if x is null undefined "" 0 And after recent developments in JavaScript, since there was a need to consider that values like "" or 0 might be considered as valid values, the tc39 team proposed the "Nullish Coalescing Operator" – ?? Using Nullish Coalescing Operator – ??
Use literal operators (eg and, or) in Groovy expressions? To make the question clear: is there a way in Groovy to allow the users to write x > 10 and y = 20 or not z but have Groovy evaluate it as if it were: x > 10 y == 20 || !z Thank you
What is the difference between ==~ and != in Groovy? In Groovy you also have to be aware that in addition to ==~, alias "Match operator", there is also =~, alias "Find Operator" and ~, alias "Pattern operator" All are explained here ==~ result type: Boolean boolean (there are no primitives in Groovy, all is not what it seems!) =~ result type: java util regex Matcher ~ result type: java util regex Pattern I presume the Groovy interpreter
Groovy - if statement in list - Stack Overflow Groovy has an in operator too, see the language documentation: 8 5 Membership operator The membership operator (in) is equivalent to calling the isCase method In the context of a List, it is equivalent to calling contains, like in the following example: def list = ['Grace','Rob','Emmy'] assert ('Emmy' in list) equivalent to calling list contains ('Emmy') or list isCase ('Emmy')
groovy - Is if (!x) the same as if (x!=null) - Stack Overflow Joe: Asking the same question for different languages is perfectly acceptable, although in general you should only ask about one language per question I would remove the bit about Java and clarify that you're asking about Groovy, not Perl, C++, Ruby, etc I don't use Groovy but this is clearly not a duplicate of that C++ question, @πάντα ῥεῖ (it may well be a dupe of some other
How does the Groovy in operator work? - Stack Overflow The Groovy "in" operator seems to mean different things in different cases Sometimes x in y means y contains(x) and sometimes it seems to call y isCase(x) How does Groovy know which one to call
Equivalent of eval() in Groovy - Stack Overflow In python, I can use eval() to execute user entered code in my program Is there anything similar I can do in Groovy? I want to have a SWING UI textbox where the user enters a piece of code that I
groovy - Is the `def` keyword optional? If so, why use it . . . - Stack . . . For instance, Groovy scripts allow you to use variables without specific type declaration, e g x = 10 However, it works because groovy lang Script class implements getProperty and setProperty methods that get triggered when you access a missing property In this case, such a variable is promoted to be a global binding, not a local variable